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United States Patent | 5,008,509 |
Hattori ,   et al. | April 16, 1991 |
A method of making a honeycomb die by using an electrode with parallel grooves in an electrical discharge machining process. The parallel grooves in the electrode are formed by a grinding wheel having a reverse tapered shape. The grinding wheel is progressively dressed during cutting of the parallel grooves.
Inventors: | Hattori; Isao (Nagoya, JP); Futamura; Shoji (Kawasaki, JP) |
Assignee: | NGK Insulators, Ltd. (Nagova City, JP); Institute of Technology Precision Electrical Discharge Works (Kawasaki, JP) |
Appl. No.: | 493666 |
Filed: | March 15, 1990 |
Mar 20, 1989[JP] | 1-68806 |
Current U.S. Class: | 219/69.15; 125/11.01; 219/69.17; 425/464; 451/56 |
Intern'l Class: | B23H 009/00; B23H 001/04; B29C 047/12; B24B 053/06 |
Field of Search: | 219/69.15,69.17,69.2 425/461,462,464 76/107.1 125/11.01,11.23 51/325,206 R |
3768344 | Oct., 1973 | Feldcamp | 219/69. |
3777595 | Dec., 1973 | Hausermann et al. | 76/107. |
4403131 | Sep., 1983 | Cunningham et al. | 219/69. |
4571892 | Feb., 1986 | Brill | 125/11. |
4722819 | Feb., 1988 | Lundsager | 425/462. |
4811722 | Mar., 1989 | Brehm et al. | 125/11. |
Foreign Patent Documents | |||
2199673 | Dec., 1974 | FR | 219/69. |
63-28522 | Feb., 1988 | JP | 219/69. |